Optical device

Abstract

An optical device for projecting light beams that is able to interact with a pixelated light source comprising a plurality of selectively activatable emitting elements. The device successively includes, in the direction of the path of the light rays, a first optical unit, a pupil and a second optical unit. The first optical unit includes an output diopter located at a first distance (d 1 ) from the pupil, and the second optical unit includes an input diopter interface located at a second distance (d 2 ) from the pupil, the second distance (d 2 ) being substantially identical to the first distance (d 1 ). The first unit includes a converging lens, and the second unit includes a doublet of lenses one of which is made of flint glass and the other of which is made of crown glass.

The invention claimed is: 
     
       1. An optical device comprising: a first optical unit, a pupil and a second optical unit arranged in succession a traveling direction of light rays received by the optical device, wherein:
 the first optical unit comprises an exit dioptric interface located at a first distance (d 1 ) from the pupil, 
 the second optical unit comprises an entrance dioptric interface located at a second distance (d 2 ) from the pupil, 
 the second distance (d 2 ) is substantially identical to the first distance (d 1 ), 
 the first optical unit comprises a convergent lens, 
 the second optical unit comprises a first lens doublet, 
 one lens of the first lens doublet is made of flint glass and is divergent, and 
 the other lens of the first lens doublet is made of crown glass and is convergent. 
 
     
     
       2. The optical device as claimed in  claim 1 , wherein the first optical unit comprises:
 a first convergent lens forming an entrance dioptric interface of the first optical unit; and 
 a second convergent lens immediately following the first convergent lens. 
 
     
     
       3. The optical device as claimed in  claim 2 , wherein the entrance dioptric interface has a meniscus shape. 
     
     
       4. The optical device as claimed in  claim 3 , wherein the first optical unit comprises a divergent lens, immediately following the second convergent lens. 
     
     
       5. The optical device as claimed in the  claim 3 , wherein lenses of the first lens doublet of the first optical unit and of the second lens doublet of the second optical unit are flint-glass lenses and crown-glass lenses alternated in the traveling direction of the light rays. 
     
     
       6. The optical device as claimed in  claim 3 , wherein at least one of the first optical unit or the second optical unit comprises at least one flint-glass lens having a refractive index at least equal to 1.6. 
     
     
       7. The optical device as claimed in  claim 2 , wherein the first optical unit comprises a divergent lens, immediately following the second convergent lens. 
     
     
       8. The optical device as claimed in  claim 7 , wherein:
 the second convergent lens and the divergent lens form a second lens doublet, 
 one lens of the second lens doublet is made of crown glass, and 
 the other lens of the second lens doublet is made of flint glass. 
 
     
     
       9. The optical device as claimed in  claim 8 , wherein lenses of the first lens doublet of the first optical unit and of the second lens doublet of the second optical unit are flint-glass lenses and crown-glass lenses alternated in the traveling direction of the light rays. 
     
     
       10. The optical device as claimed  claim 9 , wherein the flint-glass lenses have an Abbe number <50 and/or the crown-glass lenses have an Abbe number greater than 45. 
     
     
       11. The optical device as claimed in  claim 8 , wherein:
 the second convergent lens comprises an entrance dioptric interface located at a third distance (d 3 ) from the pupil, 
 the second lens doublet of the second optical unit comprises an exit dioptric interface located at a fourth distance (d 4 ) from the pupil, and 
 the third distance (d 3 ) and the fourth distance (d 4 ) are substantially identical. 
 
     
     
       12. The optical device as claimed in  claim 8 , wherein the first lens doublet of the first optical unit and the second lens doublet of the second optical unit have an identical optical power. 
     
     
       13. The optical device as claimed in  claim 7 , wherein:
 the second convergent lens comprises an entrance dioptric interface located at a third distance (d 3 ) from the pupil, 
 the second lens doublet of the second optical unit comprises an exit dioptric interface located at a fourth distance (d 4 ) from the pupil, and 
 the third distance (d 3 ) and the fourth distance (d 4 ) are substantially identical. 
 
     
     
       14. The optical device as claimed in  claim 7 , wherein the first lens doublet of the first optical unit and the second lens doublet of the second optical unit have an identical optical power. 
     
     
       15. The optical device as claimed in  claim 2 , wherein at least one of the first optical unit or the second optical unit comprises at least one flint-glass lens having a refractive index at least equal to 1.6. 
     
     
       16. The optical device as claimed in  claim 2 , wherein at least one of the first optical unit or the second optical unit comprises, at least one crown-glass lens having a refractive index at least equal to 1.45. 
     
     
       17. The optical device as claimed in  claim 2 , having a numerical aperture less than 1. 
     
     
       18. A module comprising the optical device as claimed in  claim 2 . 
     
     
       19. The module as claimed in  claim 18 , wherein the optical device is configured to receive and project a light beam on the ground. 
     
     
       20. The module as claimed in  claim 18 , wherein the optical device is configured to receive and project a light beam that forms at least part of an overall high beam. 
     
     
       21. The optical device as claimed in  claim 1 , wherein the first optical unit and the second optical unit include flint-glass lenses and crown-glass lenses alternated in the traveling direction of the light rays.